Which sentence contains only one adjective?

a) the silly clown made us laugh.

b) jayne shuddered, looked about fearfully, and then sighed.

c) where, indeed, were they going?

It would be A

Explanation:

Silly is the adjective modifying clown. Us is the indirect object and laugh is the direct object. In B fearfully is used as and adverb.  

c a wide range of indigenous instruments

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